the sultan. In 1790, Abdullah planned to launch an amphibious invasion of the island of Penang to recapture it. The BEIC with the help of the British military made a preemptive strike and attacked Kedah's navy and fort in Seberang Perai, damaging them. The sultan signed a ceasefire agreement with Light in 1791. On 7 July 1800, while George Alexander William Leith was Lieutenant-Governor of Penang, a treaty came into effect that gave the British sovereignty over Seberang Perai, subsequently named Province Wellesley. The treaty, negotiated by Penang's First Assistant George Caunter and Sultan of Kedah Dziaddin Mukarram Shah II, increased the annual payment to the sultan from 6,000 to 10,000 Spanish dollars per annum. While the acquisition improved Penang Island's military and food security, for Kedah it provided a protective strip against enemy attack from the sea. The treaty also provided for the free flow of food and commodities from Kedah to Penang Island and Province Wellesley. To this day, the Malaysian federal government still pays Kedah, on behalf of Penang, RM 10,000 annually as a symbolic gesture. Partition of Kedah After the death of Sultan Abdullah Mukarram Shah in 1797, the throne was given to his half brother Sultan Dziaddin Mukarram Shah II. However Sultan Dziaddin was forced to abdicate in 1803 by the king of Siam and was replaced by his nephew Sultan Ahmad Tajuddin II. This sparked a succession crisis as crown prince, Tunku Bisnu claimed to be the rightful heir to the throne. Fearing civil war, the Siamese kingdom reconciled the two parties by appointing Tunku Bisnu as ruler of Setul, thus establishing the Kingdom of Setul Mambang Segara in 1808. In 1892, the kingdom was reunified with the Kedah Sultanate. However, the assimilation of the Siamese people and their culture in Setul had weakened Kedah rule over it. The Anglo-Siamese Treaty in 1909 finally ended Kedah rule over Setul, as the Siamese and British agreed to exclude Setul from Kedah jurisdiction, thus separating Kedah and Setul. List of rulers The list of rulers of Kedah as given here is based to some extent on the Kedah Annals beginning with the Hindu ruler Durbar Raja I. According to the Kedah Annals, the 9th Kedah maharaja, Derbar Raja, converted to Islam and changed his name to Sultan Muzaffar Shah, thereby starting the Kedah sultanate. A genealogy was compiled in the 1920s, Al-Tarikh Salasilah Negeri Kedah Darul